CN111583878B - Backlight source control device, control method and display device - Google Patents
Backlight source control device, control method and display device Download PDFInfo
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- CN111583878B CN111583878B CN202010528488.0A CN202010528488A CN111583878B CN 111583878 B CN111583878 B CN 111583878B CN 202010528488 A CN202010528488 A CN 202010528488A CN 111583878 B CN111583878 B CN 111583878B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
Abstract
The invention discloses a backlight source control device, a control method and a display device, wherein the backlight source control device comprises a signal detection unit and a backlight driving unit, wherein: the signal detection unit is used for detecting an external input signal and outputting a control signal according to the external input signal, wherein the control signal is a pulse width modulation signal if the external input signal is detected to be in a working state, and otherwise, the control signal is a preset protection level; and the backlight driving unit is used for outputting a driving signal for driving the backlight source according to the control signal. According to the embodiment of the invention, the signal detection unit detects the external input signal to judge the state of the external drive circuit, and the control signal is output according to the state of the external drive circuit, so that the influence of high level output by the external drive circuit in a starting state on the performance of the backlight source in the prior art is effectively avoided, the defects in the prior art can be overcome, and the application prospect is wide.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight source control device, a control method and a display device.
Background
With the rapid development of display technology, liquid crystal display devices are widely used, and backlight sources in the liquid crystal display devices are used to provide light sources. In the prior art, a signal driving circuit is usually used to output a control signal, and a driving signal is sent to a backlight source through a backlight source driving unit to drive the backlight source to emit light. However, the backlight driving unit cannot operate under the condition of 100% pulse width modulation due to the limitation of the circuit itself, otherwise the backlight driving chip of the backlight driving power supply is easily burned.
Disclosure of Invention
In order to solve at least one of the above problems, a first embodiment of the present invention provides a backlight control device including a signal detection unit and a backlight driving unit, wherein:
the signal detection unit is used for detecting an external input signal and outputting a control signal according to the external input signal, wherein the control signal is a pulse width modulation signal if the external input signal is detected to be in a working state, and otherwise, the control signal is a preset protection level;
and the backlight driving unit is used for outputting a driving signal for driving the backlight source according to the control signal.
Further, the signal detection unit detects that the external input signal is a preset trigger signal, and the edge trigger detects whether the external input signal is a preset trigger signal, if so, the external input signal is in a working state, and otherwise, the external input signal is in a non-working state.
Further, the edge flip-flop is a D flip-flop, a trigger input end of the D flip-flop is connected to the external input signal, an input end of the D flip-flop is connected to an inverted output end, and an initial state of the D flip-flop is a high level.
Furthermore, the edge trigger is a JK trigger, a trigger input end of the JK trigger is connected to the external input signal, a set end of the JK trigger is connected to a forward output end, a reset end of the JK trigger is connected to a reverse output end, and an initial state of the JK trigger is a high level.
Further, the preset trigger signal is a rising edge trigger signal.
Further, the backlight control device further comprises a reverse protection circuit for performing clamping protection on a reverse surge voltage generated by the backlight.
Further, the reverse protection circuit comprises a diode connected in parallel to two sides of the freewheeling resistor, and the anode of the diode is grounded.
A second embodiment of the present invention provides a method for controlling a backlight control device according to the first embodiment, including:
the signal detection unit detects an external input signal and outputs a control signal according to the external input signal, wherein the control signal is a pulse width modulation signal if the external input signal is detected to be in a working state, and otherwise the control signal is a preset protection level;
the backlight driving unit outputs a driving signal for driving the backlight source according to the control signal.
Further, the detecting of the signal detecting unit includes an edge flip-flop, and the detecting of the external input signal by the signal detecting unit further includes:
and the edge trigger detects whether the external input signal is a preset trigger signal, if so, the external input signal is in a working state, and otherwise, the external input signal is in a non-working state.
Further, the backlight control device further includes a reverse protection circuit, and the control method further includes:
the reverse protection circuit clamps and protects the reverse impact voltage generated by the backlight source.
A third embodiment of the present invention provides a display device including the backlight control device according to the first embodiment.
The invention has the following beneficial effects:
aiming at the existing problems, the invention provides a backlight source control device, a control method and a display device, wherein the signal detection unit is used for detecting an external input signal to judge the state of an external drive circuit and outputting a control signal according to the state of the external drive circuit, so that the problem that the performance of the backlight source is influenced by the high level output by the external drive circuit in the starting state in the prior art is effectively avoided, the defects in the prior art can be overcome, and the backlight source control device has a wide application prospect.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIGS. 1a-1b show timing diagrams of two external input signals in the prior art;
fig. 2 is a block diagram illustrating a structure of a backlight control device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a backlight control device according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a D flip-flop according to an embodiment of the present invention;
FIGS. 5a-5b show timing diagrams of two external input and output signals according to one embodiment of the present invention;
fig. 6 is a schematic structural diagram of a backlight control device according to another embodiment of the present invention;
fig. 7 shows a flow chart of a control method according to an embodiment of the invention.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
In the prior art, the duty ratio of the pulse width modulation that the backlight driving unit can bear is 90%, and when the duty ratio is greater than 90% and the output current of the backlight is large, the backlight driving chip is easily burned. The inventor of the present application finds that, after studying the characteristics of the existing external driving circuit, the external driving circuit can be controlled to output a signal according with the bearing capacity of the backlight driving unit in a normal working state through circuit setting or software setting, however, a situation of continuously outputting a high level for a long time exists in the power-on starting process of the external driving circuit.
Specifically, as shown in fig. 1a and 1b, two external input signals output by the currently used external driving circuit after power-on are shown: as shown in fig. 1a, the external driving circuit outputs a low level after being powered on and started until entering a working state, and then outputs a pulse width modulation signal, in this case, because of the low level output by the external driving circuit when being started, the backlight driving chip of the backlight driving unit is not damaged; as shown in fig. 1b, the external driving circuit outputs a high level after being powered on and started until entering a working state, and then outputs a pulse width modulation signal, and the high level which lasts for a long time in the starting process is equivalent to the case that the duty ratio of the pulse width modulation is 100%, so that a backlight driving chip of the backlight driving unit is easily damaged, and the operation stability of the liquid crystal display device is reduced.
As shown in fig. 2 and 3, an embodiment of the present invention provides a backlight control apparatus including a signal detection unit and a backlight driving unit, wherein: the signal detection unit is used for detecting an external input signal and outputting a control signal according to the external input signal, wherein the control signal is a pulse width modulation signal if the external input signal is detected to be in a working state, and otherwise, the control signal is a preset protection level; and the backlight driving unit is used for outputting a driving signal for driving the backlight source according to the control signal.
In this embodiment, for the problems existing in the prior art, the signal detection unit disposed at the front end of the backlight driving unit detects the external input signal and outputs the control signal according to the detection result, so that the backlight driving unit outputs the driving signal according to the control signal to drive the backlight source, thereby effectively avoiding the problem that the backlight driving chip of the backlight driving unit is burnt out due to the continuous high level output by the external driving circuit in the non-operating state, and further improving the operation stability of the liquid crystal display device, further improving the user experience of the liquid crystal display device, and having a wide application prospect.
In a specific example, the signal detection unit detects whether the external input signal is in a working state, and outputs a pulse width modulation signal to the backlight driving unit if the external input signal is in the working state, otherwise outputs a preset protection level to the backlight driving unit. Namely, the signal detection unit judges the state of the external drive circuit according to the detected external input signal: when the external driving circuit is judged to be in a working state, namely when the external input signal is a normal working signal, outputting a pulse width modulation control signal capable of ensuring the normal working of the backlight driving unit according to the external input signal, so that the backlight driving unit outputs a driving signal for driving the backlight according to the control signal; otherwise, the external driving circuit is judged to be in a starting stage, namely when the external input signal is an abnormal working signal, the signal detection unit outputs a low level to protect a backlight driving chip of the backlight driving unit, and damage caused by a long-time high level signal is avoided.
In an optional embodiment, the signal detection unit detects that the external input signal is a preset trigger signal, and the edge trigger detects whether the external input signal is a preset trigger signal, if so, the external input signal is in an operating state, otherwise, the external input signal is in a non-operating state.
The present embodiment sets the trigger signal, which is output when the external driving circuit normally operates, as the signal detected by the signal detecting unit. In this embodiment, the rising edge trigger signal is used as a detection signal, and the edge trigger is used to detect whether the external input signal has the rising edge trigger signal to determine whether the external driving circuit is in a working state, if so, a control signal is output according to the external input signal, otherwise, a low level signal is output to protect the backlight driving chip of the backlight driving unit.
In an alternative embodiment, as shown in fig. 4, the edge flip-flop is a D flip-flop, a trigger input terminal C of the D flip-flop is connected to the external input signal, an input terminal D of the D flip-flop is connected to an inverted output terminal Q, and an initial state of the D flip-flop is a high level.
In this embodiment, the initial state of the D flip-flop is set to a high level, an external input signal is connected to a trigger input terminal of the D flip-flop, and meanwhile, an input terminal and an inverted output terminal of the D flip-flop are connected to output a control signal to the backlight driving unit through an output terminal Q of the D flip-flop.
As shown in fig. 5a, when the signal shown in fig. 1a is input, the D flip-flop outputs a low level during the start-up of the external driving circuit, and when the external driving circuit enters a normal operation state, the D flip-flop outputs a pulse width modulation signal according to the detected rising edge trigger signal. Specifically, when the initial value of the external signal is low, the truth table is as shown in table 1, that is, when the external input signal is a rising edge, the D flip-flop is turned over.
TABLE 1
| CLK | Q |
| 0 | 0 |
| 1 | 1 |
| 0 | 1 |
| 1 | 0 |
| 0 | 0 |
Similarly, as shown in fig. 5b, when the signal shown in fig. 1b is input, the D flip-flop outputs a low level during the start-up of the external driving circuit, and when the external driving circuit enters a normal operating state, the D flip-flop outputs a pulse width modulation signal according to the detected rising edge trigger signal. When the initial value of the external signal is high, the truth table is shown in table 2, and similarly, when the external input signal is a rising edge, the D flip-flop is turned over.
TABLE 2
| CLK | Q |
| 0 | 0 |
| 1 | 1 |
| 0 | 1 |
| 1 | 0 |
| 0 | 0 |
Therefore, the D flip-flop provided in this embodiment can detect an external input signal and output a control signal according to the detected state of the external driving circuit, thereby ensuring that the output control signal can meet the requirements of the backlight driving unit and preventing the backlight driving chip of the backlight driving unit from being damaged by a long-time high-level signal.
In another optional embodiment, the edge flip-flop is a JK flip-flop, a trigger input end of the JK flip-flop is connected to the external input signal, a set end of the JK flip-flop is connected to a forward output end, a reset end of the JK flip-flop is connected to a reverse output end, and an initial state of the JK flip-flop is a high level.
In this embodiment, the initial state of the JK flip-flop is a low level, an external input signal is connected to a trigger input terminal of the JK flip-flop, setting J of the JK flip-flop is equal to 1, K is equal to 1, the JK flip-flop is triggered according to a rising edge, and the method is similar to the method described above for the D flip-flop:
when the initial value of the external signal is low, the truth table is shown in table 3, that is, when the external input signal is a rising edge, the JK flip-flop is turned over.
TABLE 3
| CLK | Q |
| 0 | 0 |
| 1 | 1 |
| 0 | 1 |
| 1 | 0 |
| 0 | 0 |
When the initial value of the external signal is high, the truth table is shown in table 4, and similarly, when the external input signal is a rising edge, the JK flip-flop is turned over.
TABLE 4
| CLK | Q |
| 0 | 0 |
| 1 | 1 |
| 0 | 1 |
| 1 | 0 |
| 0 | 0 |
Therefore, the JK flip-flop provided in this embodiment can detect an external input signal and output a control signal according to the detected state of the external driving circuit, thereby ensuring that the output control signal can meet the requirements of the backlight driving unit and preventing the backlight driving chip of the backlight driving unit from being damaged by a long-time high-level signal.
It should be noted that, the specific types of edge flip-flops are not limited in the present application, and the D flip-flop and the JK flip-flop in the above embodiments are only used to illustrate specific embodiments of the present application, and those skilled in the art should select an appropriate edge flip-flop according to actual application requirements, and details thereof are not repeated herein.
As shown in fig. 3, it is considered that the backlight source in the prior art selects backlight LEDs with different optical characteristics as output loads, and the impedance characteristics of different load LEDs have a large difference, and some load LEDs generate a large reverse impulse voltage at the moment of conducting, which causes the backlight driving chip of the backlight driving unit to be burned. In an optional embodiment, the backlight control apparatus further includes a reverse protection circuit for clamping and protecting a reverse surge voltage generated by the backlight.
In this embodiment, as shown in fig. 6, a reverse protection circuit disposed at the rear end of the backlight driving unit is used to prevent a reverse surge voltage generated at the moment when the load LED of the backlight source is turned on, and specifically, the reverse surge voltage is clamped and protected by diodes connected in parallel to both sides of the freewheeling resistor R, wherein the anodes of the diodes are grounded.
Corresponding to the backlight control device provided in the foregoing embodiments, an embodiment of the present application further provides a control method using the backlight control device, and since the control method provided in the embodiment of the present application corresponds to the backlight control device provided in the foregoing several embodiments, the foregoing embodiments are also applicable to the control method provided in this embodiment, and detailed description is omitted in this embodiment.
As shown in fig. 7, an embodiment of the present application further provides a control method using the backlight control apparatus, including: the signal detection unit detects an external input signal and outputs a control signal according to the external input signal, wherein the control signal is a pulse width modulation signal if the external input signal is detected to be in a working state, and otherwise the control signal is a preset protection level; the backlight driving unit outputs a driving signal for driving the backlight source according to the control signal.
In this embodiment, for the problems existing in the prior art, the signal detection unit disposed at the front end of the backlight driving unit detects the external input signal and outputs the control signal according to the detection result, so that the backlight driving unit outputs the driving signal according to the control signal to drive the backlight source, thereby effectively avoiding the problem that the backlight driving chip of the backlight driving unit is burnt out due to the continuous high level output by the external driving circuit in the non-operating state, and further improving the operation stability of the liquid crystal display device, further improving the user experience of the liquid crystal display device, and having a wide application prospect.
Specifically, the signal detection unit judges the state of the external driving circuit according to the detected external input signal: when the external driving circuit is judged to be in a working state, namely when the external input signal is a normal working signal, outputting a pulse width modulation control signal capable of ensuring the normal working of the backlight driving unit according to the external input signal, so that the backlight driving unit outputs a driving signal for driving the backlight according to the control signal; otherwise, the external driving circuit is judged to be in a starting stage, namely when the external input signal is an abnormal working signal, the signal detection unit outputs a low level to protect a backlight driving chip of the backlight driving unit, and damage caused by a long-time high level signal is avoided. The specific implementation of this embodiment is the same as the previous embodiment, and is not described herein again.
In an optional embodiment, the signal detection unit detecting includes an edge flip-flop, and the signal detection unit detecting whether the external input signal is in an active state further includes: and the edge trigger detects whether the external input signal is a preset trigger signal, if so, the external input signal is in a working state, and otherwise, the external input signal is in a non-working state.
The present embodiment sets the trigger signal, which is output when the external driving circuit normally operates, as the signal detected by the signal detecting unit. In this embodiment, the rising edge trigger signal is used as a detection signal, and an edge trigger such as a D trigger or a JK trigger is used to detect whether an external input signal has a rising edge trigger signal to determine whether an external driving circuit is in a working state, if so, a control signal is output according to the external input signal, otherwise, a low level signal is output to protect a backlight driving chip of the backlight driving unit. The specific implementation of this embodiment is the same as the previous embodiment, and is not described herein again.
In an optional embodiment, the backlight control apparatus further includes a reverse protection circuit, and the control method further includes: the reverse protection circuit clamps and protects the reverse impact voltage generated by the backlight source.
In this embodiment, a reverse protection circuit disposed at the rear end of the backlight driving unit is used to prevent a reverse surge voltage generated at the moment when a load LED of the backlight source is turned on, and specifically, the reverse surge voltage is clamped and protected by diodes connected in parallel to two sides of a freewheeling resistor R, where anodes of the diodes are grounded.
Based on the backlight control device, an embodiment of the present application further provides a display device, which includes the backlight control device.
The display device in this embodiment is a liquid crystal display device, and may be any product or component having a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, or a navigator.
Aiming at the existing problems, the invention provides a backlight source control device, a control method and a display device, wherein the signal detection unit is used for detecting an external input signal to judge the state of an external drive circuit and outputting a control signal according to the state of the external drive circuit, so that the problem that the performance of the backlight source is influenced by the high level output by the external drive circuit in the starting state in the prior art is effectively avoided, the defects in the prior art can be overcome, and the backlight source control device has a wide application prospect.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (9)
1. A backlight control device comprising a signal detection unit and a backlight driving unit, wherein:
the signal detection unit is used for detecting an external input signal and outputting a control signal according to the external input signal, wherein the control signal is a pulse width modulation signal if the external input signal is detected to be in a working state, and otherwise, the control signal is a preset protection level;
the backlight driving unit is used for outputting a driving signal for driving the backlight source according to the control signal;
the signal detection unit detects whether the external input signal is a preset trigger signal or not, if so, the external input signal is in a working state, and otherwise, the external input signal is in a non-working state.
2. The backlight control apparatus of claim 1, wherein the edge flip-flop is a D flip-flop, a trigger input terminal of the D flip-flop is connected to the external input signal, an input terminal of the D flip-flop is connected to an inverted output terminal, and an initial state of the D flip-flop is a high level.
3. The backlight control device of claim 1, wherein the edge flip-flop is a JK flip-flop, a trigger input terminal of the JK flip-flop is connected to the external input signal, a set terminal of the JK flip-flop is connected to a forward output terminal, a reset terminal of the JK flip-flop is connected to a reverse output terminal, and an initial state of the JK flip-flop is a high level.
4. The backlight control device according to claim 1, further comprising a reverse protection circuit for clamping a reverse surge voltage generated by the backlight.
5. The backlight control device of claim 4, wherein the reverse protection circuit comprises a diode connected in parallel to both sides of the free-wheeling resistor, and the anode of the diode is grounded.
6. A control method using the backlight control apparatus according to any one of claims 1 to 5, comprising:
the signal detection unit detects an external input signal and outputs a control signal according to the external input signal, wherein the control signal is a pulse width modulation signal if the external input signal is detected to be in a working state, and otherwise the control signal is a preset protection level;
the backlight driving unit outputs a driving signal for driving the backlight source according to the control signal.
7. The control method of claim 6, wherein the signal detection unit detects that the external input signal is in an active state, and further comprising:
and the edge trigger detects whether the external input signal is a preset trigger signal, if so, the external input signal is in a working state, and otherwise, the external input signal is in a non-working state.
8. The control method according to claim 7, wherein the backlight control device further includes a reverse protection circuit, and the control method further includes:
the reverse protection circuit clamps and protects the reverse impact voltage generated by the backlight source.
9. A display device characterized by comprising the backlight control device according to any one of claims 1 to 5.
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| TW200737066A (en) * | 2006-03-22 | 2007-10-01 | Beyond Innovation Tech Co Ltd | Driving circuit with protection module for back light module |
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| CN103258510A (en) * | 2012-05-07 | 2013-08-21 | 深圳Tcl新技术有限公司 | Method and device for backlight driving protection |
| CN103456275A (en) * | 2012-05-29 | 2013-12-18 | 乐金显示有限公司 | Backlight driver of liquid crystal display device and method for driving the same |
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